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Measurement systems of liquids refraction index has been made based on light intensity changes detecting by an optical fiber. The surface of the optical fiber was modifying to detect any changes
as long as measuring process. This system using He-Ne laser as a transmitter, photodiode as a receiver, and ADC as a analog data converter into digital data and also use Aquades, Kerosene,
Solar, and Gasoline as the utilized liquid. The light source was radiated into the optical fiber and output detected by photodiode on the other end of the optical fiber. An 8-bit resolution ADC arranged with software to measure photodiode voltage excited by
laser intensity. Photodiode voltage was reading by ADC and displayed in form of refraction index on the PC. Result of experiments produce the refraction index of Aquades 1,3318; Kerosene 1,449; Solar 1,4671 and Gasoline 1,422.The deviation standard of the manufactured is 0,002.

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